Abstract
Some 33 specimens of an amabiliid tapeworm, herein identified as Tatria duodecacantha Olsen, 1939, were found in the intestine of a piedbilled grebe (the type host), Podilymbus podiceps (Linnaeus, 1758), collected near Stillwater, Oklahoma, in August 1939. The worms were fixed in Bouin's fluid, stained in borax carmine, and mounted in toto. When a manuscript in which the parasite was described as new was submitted to the JOURNAL OF PARASITOLOGY, the writer was informed of Olsen's description then in press. Later, a direct comparison of the writer's specimens with paratypes of T. duodecacantha revealed the conspecificity of the two lots. In general the author's findings are in complete agreement with those of Olsen. Because of certain differences in interpretation the writer feels justified in offering for publication his drawings (Figs. 1-7) originally intended to illustrate a new species, his comment upon two differences in observation, and a new key to the species of Tatria to include T. fuhrmranni, unfortunately overlooked by Olsen.
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